Nano silicon solvent (organic silicon sol/solvent based nano silicon dioxide dispersion)

Nano silicon solvent generally refers to solvent based silica sol (organic silicon sol): a transparent/semi transparent colloidal dispersion formed by surface modification and stable dispersion of nano amorphous silica (SiO ₂) particles in organic solvents (ethanol, isopropanol, methanol, butanone, PGMEA, etc.), rather than dissolving elemental silicon in the solvent. Basic parameter particles: amorphous SiO ₂, particle size commonly ranging from 5-50 nm, spherical as the main dispersing medium: ethanol, isopropanol, methanol, butyl acetate MEK、 Propylene glycol methyl ether acetate, etc., customizable solid content: 10% -40%. Mainstream appearance: light blue transparent, semi transparent liquid; Different modifications, hydrophilic/hydrophobic storage: cool and dark, normal shelf life 6 – 12 months, prevent water from mixing, high temperature causes gel agglomeration, core characteristics and good compatibility of oil-based resin: unlike water-based silica sol, which is afraid of oil phase, it can be directly mixed with UV resin, epoxy, acrylic acid and polyurethane systems, without demulsification risk, film forming, hardening, abrasion resistance and scratch resistance: after drying, nano particles are densely stacked, improving coating hardness, friction resistance, scratch resistance, and reducing coefficient of thermal expansion (CTE), optical film and hardening coating are standard with high specific surface area and high activity: with silicone hydroxyl groups on the surface, it can be further crosslinked, and the adhesion, heat resistance and weather resistance are significantly improved, low viscosity and penetration Strong force, can be used as ultra-thin coating; Adjustable extinction and matte effect with good insulation properties, suitable for electronic insulation coatings and packaging materials. Shortboard: Most organic solvents are flammable and contain VOCs; It is sensitive to water, and some brands are easy to flocculate gel when encountering a large amount of water.

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Main application scenarios

1. Hardened/wear-resistant coating: optical PET film, lenses, plastic shell, hardware protective coating, UV varnish to enhance scratch resistance and fingerprint resistance

2. Ink and printing coatings: thixotropic, anti settling, wear-resistant, matte, enhancing ink adhesion

3. Composite materials, adhesives: epoxy, potting adhesive reinforcement, reducing shrinkage, improving heat resistance and insulation

4. Precision Polishing (CMP): High purity solvent based silica sol used for semiconductor and sapphire polishing solution (electronic grade)

5. Fireproof and high temperature resistant coating: Paired with the nano crystal silicon fireproof system you saw before, it forms an inorganic dense barrier layer to enhance fire resistance and block smoke

6. Textile and leather surface treatment: wear-resistant, anti fouling, and tactile modification

7. Catalyst carrier, ceramic precursor

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Simple comparison with water-based silica sol and gas-phase silica dispersion

Water based silica sol: aqueous medium, inexpensive, low VOC; Only water-based system, which is easy to be gel when added to oily resin

Nano silicon solvent (organic silicon sol): Organic solvent, higher price, suitable for UV/oil-based resin, better coating transparency

Gas phase silicon dispersion slurry: powder physical dispersion, biased filler; Silica sol is an in-situ colloid with stronger film-forming and cross-linking activity

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Usage and safety points

Suggestion for addition: Stir at low speed, add in small amounts in batches to avoid overheating during high-speed shearing; Prioritize conducting small-scale tests to evaluate compatibility

Protection: Organic solvents are flammable, keep away from sources of fire, and operate with ventilation; Avoid prolonged skin contact

Taboos: strong alkaline materials and a large amount of water will easily cause gel failure